This engine used the Hesselman engine low compression combustion system where oils of varying grades were sprayed into the cylinder during compression but ignition was initiated and assisted by a spark plug.
[1] Overhead inlet and exhaust valves, water cooling and a magneto for ignition were standard features.
The wobble plate arrangement cleverly employed a bevel gear set to prevent its rotation around the crankshaft.
One bevel gear was fitted to the rear of the wobble plate itself and meshed with another which was fixed to the main body of the engine.
They were manufactured by Hulsemo N.V., Casimirlaan 5, Arnhem, The Netherlands, and were exhibited in the Berlin and Amsterdam Shows during 1938.